In the time it took me to compose my posting just above, seven others posted to this thread. So to add to what Q says, here in B. C. there are four species of Vaccinium that I can think of, two of which I would sometimes call "huckleberry". One could do a great folklore study on which different groups of people in which local areas call which species of Vaccinium "huckleberry".
I have got into arguments about this with people who think that the berry they call huckleberry is the true huckleberry, whereas the berry I call huckleberry ought to be called "red blueberry" or "black blueberry" or "Indian blueberry".